DeepFace, or Facebook's facial recognition software is 97% accurate. Meaning if you upload a photo of someone who is already on Facebook, the company will be able to identify the person with 97% probability.
If you think about it, that is scary!
https://en.wikipedia.org/wiki/DeepFace
And things like this is just what they (Facebook, Google, CIA, FBI, NSA) reveal, guess what insane technology they are using in secret :)